package com.atguigu.gulimail.product.service.impl;

import com.atguigu.gulimail.product.service.CategoryBrandRelationService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimail.product.dao.CategoryDao;
import com.atguigu.gulimail.product.entity.CategoryEntity;
import com.atguigu.gulimail.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
	@Autowired
	private CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

	@Override
	public List<CategoryEntity> listWithTree() {
    	// 查找出所有的分类信息
		List<CategoryEntity> categoryEntities = baseMapper.selectList(null);

		// 找到所有的一级分类
		List<CategoryEntity> level1Menus = categoryEntities.stream()
							.filter(categoryEntity -> categoryEntity.getParentCid() == 0)
							.map(categoryEntity -> {
								categoryEntity.setChildren(getChildren(categoryEntity, categoryEntities));
								return categoryEntity;
							}).sorted((menu1, menu2)->{
								return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
							})
							.collect(Collectors.toList());
		return level1Menus;
	}


	@Override
	public void removeMenuByIds(List<Long> asList) {
		//TODO  1、检查当前删除的菜单，是否被别的地方引用

		//逻辑删除
		baseMapper.deleteBatchIds(asList);
	}

	//[2,25,225]
	@Override
	public Long[] findCatelogPath(Long catelogId) {
		List<Long> paths = new ArrayList<>();
		List<Long> parentPath = findParentPath(catelogId, paths);
		Collections.reverse(parentPath);
		return parentPath.toArray(new Long[parentPath.size()]);
	}

	@Override
	public void updateDetail(CategoryEntity category) {
		this.updateById(category);
		if(StringUtils.isNotBlank(category.getName())){
			categoryBrandRelationService.updateCategory(category.getCatId(), category.getName());
		}
	}

	//225,25,2
	private List<Long> findParentPath(Long catelogId,List<Long> paths){
		//1、收集当前节点id
		paths.add(catelogId);
		CategoryEntity byId = this.getById(catelogId);
		if(byId.getParentCid()!=0){
			findParentPath(byId.getParentCid(),paths);
		}
		return paths;
	}

	/**
	 * 递归查找所有菜单的子菜单
	 * @param root
	 * @param all
	 * @return
	 */
	private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all){
    	return all.stream().filter(categoryEntity -> {
			return categoryEntity.getParentCid().longValue() == root.getCatId().longValue();
		}).map(categoryEntity -> {
			categoryEntity.setChildren(getChildren(categoryEntity, all));
			return categoryEntity;
		}).sorted((menu1, menu2) -> {
			return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
		}).collect(Collectors.toList());
	}
}